Direct Grounded System - ABB Relion 670 Series Applications Manual

Bay control, version 2.1 ansi

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Voltage protection

ANSI07000190 V1 EN-US

Figure 92: Ground fault in Non-effectively grounded systems

Direct grounded system

In direct grounded systems, an ground fault on one phase indicates a voltage collapse in that

phase. The two healthy phases will have normal phase-to-ground voltages. The residual sum will

have the same value as the remaining phase-to-ground voltage. See figure 93.

ANSI07000190-1-en.vsd

1MRK 511 358-UUS A

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Application manual

Relion rec670